F Spaced Dimarzio Pickups

I have a quick question about Dimarzio pickups. If I am correct, the difference between F Spaced and Regular pickups is the distance between magnets. What does this mean in terms of tonal properties between the two? Sustain? Output?

Measure string spacing - E string to E string across the centreline of the coil nearest the fretboard (assuming they're humbuckers). 48mm is standard spacing, 51.5mm is F-spaced - guitars with trems pretty much always use F-spaced in the bridge, neck can be F-spaced or standard dependng on the nut width, hard tails usually use standard spacing, but some use F-spacing just to be awkward.

It's not too much of a problem at the neck, because you've got a nice wide string vibration, but it's a bit tighter at the bridge and it could affect the tone if the srings aren't lined up over the pole pieces, more of an issue with lower output pickups i'd assume.